Sigma InfoSec
Managed Microsoft 365 Security

Your M365 tenant is the crown jewels.

Microsoft 365 is the operational heart of your organization — and the number one target for cybercriminals. One compromised identity or stolen session cookie can give attackers total access to your financial records, customer data, and internal communications. We turn your Microsoft Defender suite into an active defense system: a fully managed MXDR (Managed Extended Detection and Response) operation backed by 24/7 SOC analysts, proprietary AI triage, and custom threat hunting.

BEC & token theft defenseMFA bypass defenseAI triage in seconds
TENANT.LIVELIVE
5
Attack domains defended
3 sec
AI alert triage
AiTM phishing — session cookie stolenHijacked
Covert forwarding rule — finance mailboxBEC
Token anomaly — sessions revokedContained
Rogue OAuth grant — access purgedPurged
Identity threats neutralizedSeconds, not days

Hijacked sessions revoked in real time

#1
The Primary Target

Why Microsoft 365 is the primary target

#1 Microsoft 365 is the number one attack vector in the modern enterprise

Adversaries do not break in through complex firewall exploits when they can walk straight through the front door using Microsoft 365.

TOKEN THEFT

Identity hijacking & token theft

Attackers steal active session cookies to bypass MFA, impersonate executives, and navigate cloud applications without triggering basic password alerts.

BEC

Business Email Compromise (BEC)

Cybercriminals establish covert inbox forwarding rules, manipulate wire transfers, and launch lateral phishing campaigns directly from authenticated employee mailboxes.

OAUTH BACKDOOR

Third-party OAuth exploitation

Rogue cloud applications trick users into granting permissions, giving attackers persistent, back-door access to corporate OneDrive, SharePoint, and Teams data.

ALERT FLOOD

Unmonitored alert floods

Microsoft Defender generates massive telemetry across endpoints, identities, and emails — leaving critical threat signals buried under thousands of daily alerts.

The Service

Every identity, inbox, and file — defended

We deploy 24/7 MXDR, proprietary AI, and custom threat hunting to protect your identities, emails, files, and core assets from initial access to lateral movement.

High-value asset protection

Treat Microsoft 365 as the primary attack surface. We protect sensitive files, financial workflows, and executive communications from exfiltration and Business Email Compromise (BEC).

Identity & session hijacking shield

Guard Entra ID against token theft, pass-the-hash attacks, rogue OAuth app consents, and MFA bypass attempts — the keys-to-the-kingdom vectors.

Proprietary AI investigation & instant containment

Cut through millions of noisy Defender signals. Our proprietary AI engine correlates, triages, and isolates compromised accounts or machines in seconds.

Continuous AI-driven tenant hardening

Eliminate dangerous configuration drift. Our automated AI tenant audits continuously inspect and harden your settings against real-world attack techniques.

How It Works

Every vector secured, around the clock

We actively secure every vector of your Microsoft ecosystem — identity, email, endpoints, and cloud apps.

1

Continuous vulnerability & hardening audits

Our proprietary AI engine scans your Microsoft 365 tenant against CIS benchmarks and real-world attack vectors, flagging insecure conditional access policies, legacy auth, and risky OAuth grants.

2

24/7 AI-powered threat investigation

We route data from Defender for Endpoint, Office 365, Identity, and Cloud Apps through our SOC. Our custom AI correlates signals across all vectors, separating noise from true threats instantly.

3

Proactive threat hunting & instant response

Our analysts execute custom search queries to locate hidden threats. When a true positive is exposed, our automated systems revoke session tokens, isolate machines, and purge malicious rules immediately.

Engine Room

Powered by the full Microsoft security suite + our AI

We maximize and enforce the security capabilities built into your Microsoft licensing stack.

01

Microsoft Defender for Identity

Monitors Active Directory and Entra ID signals to detect compromised credentials, lateral movement, privilege escalation, and domain dominance attempts.

02

Microsoft Defender for Office 365

Neutralizes Business Email Compromise (BEC), spear-phishing, credential harvesting pages, and weaponized links across Exchange, Teams, and SharePoint.

03

Microsoft Defender for Endpoint

Complete EDR management, real-time behavioral analytics, automated investigation, and device containment across all operating systems.

04

Microsoft Defender for Cloud Apps

Provides Shadow IT visibility, controls cloud data exfiltration, monitors unsanctioned SaaS tools, and flags anomalous cloud user activity.

05

Proprietary AI Triaging & Investigation

Accelerates incident analysis, ingesting raw Defender telemetry to reconstruct attack timelines and guide immediate analyst action within seconds.

06

Custom M365 Threat Hunting Engine

Battle-tested search queries specifically engineered to identify "Living-off-the-Cloud" techniques, covert mailbox rules, and session hijacking.

The Difference

Default tenant vs. actively defended tenant

Default / Unmonitored M365 Tenant
Sigma Managed M365 Defense
Protection focus
Basic spam filtering and standard antivirus coverage
Comprehensive cross-domain defense covering endpoints, Entra ID, mail, SharePoint, and cloud apps
MFA & cookie security
Susceptible to session cookie theft, AiTM phishing, and MFA bypass
Real-time monitoring for token hijacking, impossible travel, and anomalous identity behavior
Tenant hardening
Static configurations that drift over time, leaving security gaps wide open
Proprietary AI auditing: continuous automated tenant assessments to enforce hardened baselines and eliminate misconfigurations
Alert triage & speed
Internal IT teams spend hours sifting through noisy, complex portal logs
Proprietary AI response engine: triages, correlates, and validates incoming threat signals in seconds
Threat hunting
Limited to basic, built-in detection rules
Custom library of advanced threat hunting queries built from active incident response field experience
Incident response
Slow manual response; compromised identities remain active for days
Instant containment: automated token revocation, account isolation, and malicious transport rule purge
FAQ

Frequently Asked Questions

Get Started

Protect yourMicrosoft 365 ecosystem.

Your emails, identities, and files are your business's most valuable assets. Do not leave them exposed to unmonitored threat activity.

Speak with an Expert

Identity shield · AI triage in seconds · Continuous tenant hardening